Electron induced ionization-excitation (IE) of helium is a basic four-body Coulomb problem in which all thefour charged particles are actively involved. It is much more challenging to both experiment and theory in con...Electron induced ionization-excitation (IE) of helium is a basic four-body Coulomb problem in which all thefour charged particles are actively involved. It is much more challenging to both experiment and theory in contrastto direct ionization with the residual He+ ion in the ground state. The 2s or 2p separated TDCS data, especially atlow incident energy range where the high order effects are expected to play a significant role, would offer the moststringent test to theoretical models. However, only one experiment at high incident energy achieved the TDCSs for2p state till now due to the small cross section and the low detection efficiency for multi-coincidence events[1].展开更多
基金Major State Basic Research DevelopmentProgram of China (973 Program, 2010CB832902) and National Natural Science Foundation of China(11204322 and 10979007.)
文摘Electron induced ionization-excitation (IE) of helium is a basic four-body Coulomb problem in which all thefour charged particles are actively involved. It is much more challenging to both experiment and theory in contrastto direct ionization with the residual He+ ion in the ground state. The 2s or 2p separated TDCS data, especially atlow incident energy range where the high order effects are expected to play a significant role, would offer the moststringent test to theoretical models. However, only one experiment at high incident energy achieved the TDCSs for2p state till now due to the small cross section and the low detection efficiency for multi-coincidence events[1].
